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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Shares
Additional Paid-In Capital
Accumulated Other Comprehensive (Loss) Income
Retained Earnings
Treasury Stock
Balance, beginning of period at Dec. 31, 2021   $ 1,641 $ 1,428,952 $ 50,707 $ 2,754,814 $ 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   9 (9)      
Cancellation of treasury stock   (35) (97,735)     97,770
Dividends and dividend equivalents declared     683   (68,229)  
Stock-based compensation expense     13,707      
Other comprehensive income (loss) $ (474,284)     (474,284)    
Net income 683,987       683,987  
Treasury stock acquired           (97,770)
Balance, end of period at Sep. 30, 2022 4,294,208 1,615 1,345,598 (423,577) 3,370,572 0
Balance, beginning of period at Jun. 30, 2022   1,615 1,340,650 (286,567) 3,216,297 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   0 0      
Cancellation of treasury stock   0 (18)     18
Dividends and dividend equivalents declared     264   (23,776)  
Stock-based compensation expense     4,702      
Other comprehensive income (loss) (137,010)     (137,010)    
Net income 178,051       178,051  
Treasury stock acquired           (18)
Balance, end of period at Sep. 30, 2022 4,294,208 1,615 1,345,598 (423,577) 3,370,572 0
Balance, beginning of period at Dec. 31, 2022 4,462,309 1,615 1,350,377 (382,790) 3,493,107 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   8 (8)      
Cancellation of treasury stock   (20) (55,850)     55,870
Dividends and dividend equivalents declared     1,259   (81,056)  
Stock-based compensation expense     13,939      
Other comprehensive income (loss) (53,593)     (53,593)    
Net income 521,019       521,019  
Treasury stock acquired           (55,870)
Balance, end of period at Sep. 30, 2023 4,808,007 1,603 1,309,717 (436,383) 3,933,070 0
Balance, beginning of period at Jun. 30, 2023   1,605 1,309,834 (360,135) 3,782,048 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   0 0      
Cancellation of treasury stock   (2) (5,037)     5,039
Dividends and dividend equivalents declared     441   (26,937)  
Stock-based compensation expense     4,479      
Other comprehensive income (loss) (76,248)     (76,248)    
Net income 177,959       177,959  
Treasury stock acquired           (5,039)
Balance, end of period at Sep. 30, 2023 $ 4,808,007 $ 1,603 $ 1,309,717 $ (436,383) $ 3,933,070 $ 0